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ThreadLocal再次挖掘它的知识点
2022-06-27 08:25:00 【C_x_330】
ThreadLocal存放的值是线程封闭,线程间互斥的,主要用于线程内共享一些数据,避免通过参数来传递 线程的角度看,每个线程都保持一个对其线程局部变量副本的隐式引用,只要线程是活动的并且 ThreadLocal 实例是可访问的;在线程消失之后,其线程局部实例的所有副本都会被垃圾回收 在Thread类中有一个Map,用于存储每一个线程的变量的副本。 对于多线程资源共享的问题,同步机制采用了“以时间换空间”的方式,而ThreadLocal采用了“以空间换时间”的方式
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